Abstract: In recent years,the ecological environment of some region is getting worse annually,and more and more ecological security problems are happening. This article based on the analysis of agricultural ecological environment evolution for the western part of Jilin province within thirty year,assess agricultural ecological security of this region comprehensively,such as the ecological environment quality,environmental carrying capacity and ecological restoration ability etc. The result shows that the index of agricultural ecological quality declined slightly from 1980 to 1990,but it was increased gradually since 2000. In addition,the index of environment carrying capacity has been increasing since 1980. As for the index of ecological restoration ability,it has been going up in fluctuant way since 1980 with the figure slightly lower than the previous year in 1985 and 2000. The predict figures of ecological security in western part of Jilin province are 5.622 074 and 5.562 274 in 2015 and 2020. That means the ecological security has chance to turn good. According to these indexes,we have put forward to the measures to ensure sustainable development of agriculture in western part of Jilin province.